Post your grub.cfg file and what path is the iso file?
This is my path from my hard drive's Ubuntu, so it has the extra media and label from the flash drive of MC4GB, note case is also important:
/media/MC4GB/boot/iso
This is my entry for 11.10. All my recent installs have used a similar ISO boot but from another hard drive.
I often have to experiment with this as with multiple drives it often changes. hd0 usually works better than the /dev/sdd.
(/dev/sdd,msdos1)
Code:
set default=0
set menu_color_normal=cyan/blue
set menu_color_highlight=white/blue
set gfxpayload=800x600
menuentry "Ubuntu 11.10 Oneiric 64bit" {
set isofile="/boot/iso/oneiric-desktop-amd64.iso"
loopback loop (/dev/sdd,msdos1)/$isofile
linux (loop)/casper/vmlinuz boot=casper iso-scan/filename=$isofile nomodeset noprompt
initrd (loop)/casper/initrd.lz
}
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